]>
Commit | Line | Data |
---|---|---|
11fdf7f2 TL |
1 | #include "include/random.h" |
2 | #include "common/errno.h" | |
3 | ||
4 | #include "svc_notify.h" | |
5 | #include "svc_finisher.h" | |
6 | #include "svc_zone.h" | |
7 | #include "svc_rados.h" | |
8 | ||
9 | #include "rgw/rgw_zone.h" | |
10 | ||
11 | #define dout_subsys ceph_subsys_rgw | |
12 | ||
13 | static string notify_oid_prefix = "notify"; | |
14 | ||
15 | class RGWWatcher : public librados::WatchCtx2 { | |
16 | CephContext *cct; | |
17 | RGWSI_Notify *svc; | |
18 | int index; | |
19 | RGWSI_RADOS::Obj obj; | |
20 | uint64_t watch_handle; | |
21 | int register_ret{0}; | |
22 | librados::AioCompletion *register_completion{nullptr}; | |
23 | ||
24 | class C_ReinitWatch : public Context { | |
25 | RGWWatcher *watcher; | |
26 | public: | |
27 | explicit C_ReinitWatch(RGWWatcher *_watcher) : watcher(_watcher) {} | |
28 | void finish(int r) override { | |
29 | watcher->reinit(); | |
30 | } | |
31 | }; | |
32 | public: | |
33 | RGWWatcher(CephContext *_cct, RGWSI_Notify *s, int i, RGWSI_RADOS::Obj& o) : cct(_cct), svc(s), index(i), obj(o), watch_handle(0) {} | |
34 | void handle_notify(uint64_t notify_id, | |
35 | uint64_t cookie, | |
36 | uint64_t notifier_id, | |
37 | bufferlist& bl) override { | |
38 | ldout(cct, 10) << "RGWWatcher::handle_notify() " | |
39 | << " notify_id " << notify_id | |
40 | << " cookie " << cookie | |
41 | << " notifier " << notifier_id | |
42 | << " bl.length()=" << bl.length() << dendl; | |
43 | ||
44 | if (unlikely(svc->inject_notify_timeout_probability == 1) || | |
45 | (svc->inject_notify_timeout_probability > 0 && | |
46 | (svc->inject_notify_timeout_probability > | |
47 | ceph::util::generate_random_number(0.0, 1.0)))) { | |
48 | ldout(cct, 0) | |
49 | << "RGWWatcher::handle_notify() dropping notification! " | |
50 | << "If this isn't what you want, set " | |
51 | << "rgw_inject_notify_timeout_probability to zero!" << dendl; | |
52 | return; | |
53 | } | |
54 | ||
55 | svc->watch_cb(notify_id, cookie, notifier_id, bl); | |
56 | ||
57 | bufferlist reply_bl; // empty reply payload | |
58 | obj.notify_ack(notify_id, cookie, reply_bl); | |
59 | } | |
60 | void handle_error(uint64_t cookie, int err) override { | |
61 | lderr(cct) << "RGWWatcher::handle_error cookie " << cookie | |
62 | << " err " << cpp_strerror(err) << dendl; | |
63 | svc->remove_watcher(index); | |
64 | svc->schedule_context(new C_ReinitWatch(this)); | |
65 | } | |
66 | ||
67 | void reinit() { | |
68 | int ret = unregister_watch(); | |
69 | if (ret < 0) { | |
70 | ldout(cct, 0) << "ERROR: unregister_watch() returned ret=" << ret << dendl; | |
71 | return; | |
72 | } | |
73 | ret = register_watch(); | |
74 | if (ret < 0) { | |
75 | ldout(cct, 0) << "ERROR: register_watch() returned ret=" << ret << dendl; | |
76 | return; | |
77 | } | |
78 | } | |
79 | ||
80 | int unregister_watch() { | |
81 | int r = svc->unwatch(obj, watch_handle); | |
82 | if (r < 0) { | |
83 | return r; | |
84 | } | |
85 | svc->remove_watcher(index); | |
86 | return 0; | |
87 | } | |
88 | ||
89 | int register_watch_async() { | |
90 | if (register_completion) { | |
91 | register_completion->release(); | |
92 | register_completion = nullptr; | |
93 | } | |
94 | register_completion = librados::Rados::aio_create_completion(nullptr, nullptr, nullptr); | |
95 | register_ret = obj.aio_watch(register_completion, &watch_handle, this); | |
96 | if (register_ret < 0) { | |
97 | register_completion->release(); | |
98 | return register_ret; | |
99 | } | |
100 | return 0; | |
101 | } | |
102 | ||
103 | int register_watch_finish() { | |
104 | if (register_ret < 0) { | |
105 | return register_ret; | |
106 | } | |
107 | if (!register_completion) { | |
108 | return -EINVAL; | |
109 | } | |
110 | register_completion->wait_for_safe(); | |
111 | int r = register_completion->get_return_value(); | |
112 | register_completion->release(); | |
113 | register_completion = nullptr; | |
114 | if (r < 0) { | |
115 | return r; | |
116 | } | |
117 | svc->add_watcher(index); | |
118 | return 0; | |
119 | } | |
120 | ||
121 | int register_watch() { | |
122 | int r = obj.watch(&watch_handle, this); | |
123 | if (r < 0) { | |
124 | return r; | |
125 | } | |
126 | svc->add_watcher(index); | |
127 | return 0; | |
128 | } | |
129 | }; | |
130 | ||
131 | ||
132 | class RGWSI_Notify_ShutdownCB : public RGWSI_Finisher::ShutdownCB | |
133 | { | |
134 | RGWSI_Notify *svc; | |
135 | public: | |
136 | RGWSI_Notify_ShutdownCB(RGWSI_Notify *_svc) : svc(_svc) {} | |
137 | void call() override { | |
138 | svc->shutdown(); | |
139 | } | |
140 | }; | |
141 | ||
142 | string RGWSI_Notify::get_control_oid(int i) | |
143 | { | |
144 | char buf[notify_oid_prefix.size() + 16]; | |
145 | snprintf(buf, sizeof(buf), "%s.%d", notify_oid_prefix.c_str(), i); | |
146 | ||
147 | return string(buf); | |
148 | } | |
149 | ||
150 | RGWSI_RADOS::Obj RGWSI_Notify::pick_control_obj(const string& key) | |
151 | { | |
152 | uint32_t r = ceph_str_hash_linux(key.c_str(), key.size()); | |
153 | ||
154 | int i = r % num_watchers; | |
155 | return notify_objs[i]; | |
156 | } | |
157 | ||
158 | int RGWSI_Notify::init_watch() | |
159 | { | |
160 | num_watchers = cct->_conf->rgw_num_control_oids; | |
161 | ||
162 | bool compat_oid = (num_watchers == 0); | |
163 | ||
164 | if (num_watchers <= 0) | |
165 | num_watchers = 1; | |
166 | ||
167 | watchers = new RGWWatcher *[num_watchers]; | |
168 | ||
169 | int error = 0; | |
170 | ||
171 | notify_objs.resize(num_watchers); | |
172 | ||
173 | for (int i=0; i < num_watchers; i++) { | |
174 | string notify_oid; | |
175 | ||
176 | if (!compat_oid) { | |
177 | notify_oid = get_control_oid(i); | |
178 | } else { | |
179 | notify_oid = notify_oid_prefix; | |
180 | } | |
181 | ||
494da23a | 182 | notify_objs[i] = rados_svc->handle().obj({control_pool, notify_oid}); |
11fdf7f2 TL |
183 | auto& notify_obj = notify_objs[i]; |
184 | ||
185 | int r = notify_obj.open(); | |
186 | if (r < 0) { | |
187 | ldout(cct, 0) << "ERROR: notify_obj.open() returned r=" << r << dendl; | |
188 | return r; | |
189 | } | |
190 | ||
191 | librados::ObjectWriteOperation op; | |
192 | op.create(false); | |
193 | r = notify_obj.operate(&op, null_yield); | |
194 | if (r < 0 && r != -EEXIST) { | |
195 | ldout(cct, 0) << "ERROR: notify_obj.operate() returned r=" << r << dendl; | |
196 | return r; | |
197 | } | |
198 | ||
199 | RGWWatcher *watcher = new RGWWatcher(cct, this, i, notify_obj); | |
200 | watchers[i] = watcher; | |
201 | ||
202 | r = watcher->register_watch_async(); | |
203 | if (r < 0) { | |
204 | ldout(cct, 0) << "WARNING: register_watch_aio() returned " << r << dendl; | |
205 | error = r; | |
206 | continue; | |
207 | } | |
208 | } | |
209 | ||
210 | for (int i = 0; i < num_watchers; ++i) { | |
211 | int r = watchers[i]->register_watch_finish(); | |
212 | if (r < 0) { | |
213 | ldout(cct, 0) << "WARNING: async watch returned " << r << dendl; | |
214 | error = r; | |
215 | } | |
216 | } | |
217 | ||
218 | if (error < 0) { | |
219 | return error; | |
220 | } | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
225 | void RGWSI_Notify::finalize_watch() | |
226 | { | |
227 | for (int i = 0; i < num_watchers; i++) { | |
228 | RGWWatcher *watcher = watchers[i]; | |
229 | watcher->unregister_watch(); | |
230 | delete watcher; | |
231 | } | |
232 | ||
233 | delete[] watchers; | |
234 | } | |
235 | ||
236 | int RGWSI_Notify::do_start() | |
237 | { | |
238 | int r = zone_svc->start(); | |
239 | if (r < 0) { | |
240 | return r; | |
241 | } | |
242 | ||
243 | assert(zone_svc->is_started()); /* otherwise there's an ordering problem */ | |
244 | ||
245 | r = rados_svc->start(); | |
246 | if (r < 0) { | |
247 | return r; | |
248 | } | |
249 | r = finisher_svc->start(); | |
250 | if (r < 0) { | |
251 | return r; | |
252 | } | |
253 | ||
254 | control_pool = zone_svc->get_zone_params().control_pool; | |
255 | ||
256 | int ret = init_watch(); | |
257 | if (ret < 0) { | |
258 | lderr(cct) << "ERROR: failed to initialize watch: " << cpp_strerror(-ret) << dendl; | |
259 | return ret; | |
260 | } | |
261 | ||
262 | shutdown_cb = new RGWSI_Notify_ShutdownCB(this); | |
263 | int handle; | |
264 | finisher_svc->register_caller(shutdown_cb, &handle); | |
265 | finisher_handle = handle; | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | void RGWSI_Notify::shutdown() | |
271 | { | |
272 | if (finalized) { | |
273 | return; | |
274 | } | |
275 | ||
276 | if (finisher_handle) { | |
277 | finisher_svc->unregister_caller(*finisher_handle); | |
278 | } | |
279 | finalize_watch(); | |
280 | ||
281 | delete shutdown_cb; | |
282 | ||
283 | finalized = true; | |
284 | } | |
285 | ||
286 | RGWSI_Notify::~RGWSI_Notify() | |
287 | { | |
288 | shutdown(); | |
289 | } | |
290 | ||
291 | int RGWSI_Notify::unwatch(RGWSI_RADOS::Obj& obj, uint64_t watch_handle) | |
292 | { | |
293 | int r = obj.unwatch(watch_handle); | |
294 | if (r < 0) { | |
295 | ldout(cct, 0) << "ERROR: rados->unwatch2() returned r=" << r << dendl; | |
296 | return r; | |
297 | } | |
494da23a | 298 | r = rados_svc->handle().watch_flush(); |
11fdf7f2 TL |
299 | if (r < 0) { |
300 | ldout(cct, 0) << "ERROR: rados->watch_flush() returned r=" << r << dendl; | |
301 | return r; | |
302 | } | |
303 | return 0; | |
304 | } | |
305 | ||
306 | void RGWSI_Notify::add_watcher(int i) | |
307 | { | |
308 | ldout(cct, 20) << "add_watcher() i=" << i << dendl; | |
309 | RWLock::WLocker l(watchers_lock); | |
310 | watchers_set.insert(i); | |
311 | if (watchers_set.size() == (size_t)num_watchers) { | |
312 | ldout(cct, 2) << "all " << num_watchers << " watchers are set, enabling cache" << dendl; | |
313 | _set_enabled(true); | |
314 | } | |
315 | } | |
316 | ||
317 | void RGWSI_Notify::remove_watcher(int i) | |
318 | { | |
319 | ldout(cct, 20) << "remove_watcher() i=" << i << dendl; | |
320 | RWLock::WLocker l(watchers_lock); | |
321 | size_t orig_size = watchers_set.size(); | |
322 | watchers_set.erase(i); | |
323 | if (orig_size == (size_t)num_watchers && | |
324 | watchers_set.size() < orig_size) { /* actually removed */ | |
325 | ldout(cct, 2) << "removed watcher, disabling cache" << dendl; | |
326 | _set_enabled(false); | |
327 | } | |
328 | } | |
329 | ||
330 | int RGWSI_Notify::watch_cb(uint64_t notify_id, | |
331 | uint64_t cookie, | |
332 | uint64_t notifier_id, | |
333 | bufferlist& bl) | |
334 | { | |
335 | RWLock::RLocker l(watchers_lock); | |
336 | if (cb) { | |
337 | return cb->watch_cb(notify_id, cookie, notifier_id, bl); | |
338 | } | |
339 | return 0; | |
340 | } | |
341 | ||
342 | void RGWSI_Notify::set_enabled(bool status) | |
343 | { | |
344 | RWLock::WLocker l(watchers_lock); | |
345 | _set_enabled(status); | |
346 | } | |
347 | ||
348 | void RGWSI_Notify::_set_enabled(bool status) | |
349 | { | |
350 | enabled = status; | |
351 | if (cb) { | |
352 | cb->set_enabled(status); | |
353 | } | |
354 | } | |
355 | ||
356 | int RGWSI_Notify::distribute(const string& key, bufferlist& bl) | |
357 | { | |
358 | RGWSI_RADOS::Obj notify_obj = pick_control_obj(key); | |
359 | ||
360 | ldout(cct, 10) << "distributing notification oid=" << notify_obj.get_ref().obj | |
361 | << " bl.length()=" << bl.length() << dendl; | |
362 | return robust_notify(notify_obj, bl); | |
363 | } | |
364 | ||
365 | int RGWSI_Notify::robust_notify(RGWSI_RADOS::Obj& notify_obj, bufferlist& bl) | |
366 | { | |
367 | // The reply of every machine that acks goes in here. | |
368 | boost::container::flat_set<std::pair<uint64_t, uint64_t>> acks; | |
369 | bufferlist rbl; | |
370 | ||
371 | // First, try to send, without being fancy about it. | |
372 | auto r = notify_obj.notify(bl, 0, &rbl); | |
373 | ||
374 | // If that doesn't work, get serious. | |
375 | if (r < 0) { | |
376 | ldout(cct, 1) << "robust_notify: If at first you don't succeed: " | |
377 | << cpp_strerror(-r) << dendl; | |
378 | ||
379 | ||
380 | auto p = rbl.cbegin(); | |
381 | // Gather up the replies to the first attempt. | |
382 | try { | |
383 | uint32_t num_acks; | |
384 | decode(num_acks, p); | |
385 | // Doing this ourselves since we don't care about the payload; | |
386 | for (auto i = 0u; i < num_acks; ++i) { | |
387 | std::pair<uint64_t, uint64_t> id; | |
388 | decode(id, p); | |
389 | acks.insert(id); | |
390 | ldout(cct, 20) << "robust_notify: acked by " << id << dendl; | |
391 | uint32_t blen; | |
392 | decode(blen, p); | |
393 | p.advance(blen); | |
394 | } | |
395 | } catch (const buffer::error& e) { | |
396 | ldout(cct, 0) << "robust_notify: notify response parse failed: " | |
397 | << e.what() << dendl; | |
398 | acks.clear(); // Throw away junk on failed parse. | |
399 | } | |
400 | ||
401 | ||
402 | // Every machine that fails to reply and hasn't acked a previous | |
403 | // attempt goes in here. | |
404 | boost::container::flat_set<std::pair<uint64_t, uint64_t>> timeouts; | |
405 | ||
406 | auto tries = 1u; | |
407 | while (r < 0 && tries < max_notify_retries) { | |
408 | ++tries; | |
409 | rbl.clear(); | |
410 | // Reset the timeouts, we're only concerned with new ones. | |
411 | timeouts.clear(); | |
412 | r = notify_obj.notify(bl, 0, &rbl); | |
413 | if (r < 0) { | |
414 | ldout(cct, 1) << "robust_notify: retry " << tries << " failed: " | |
415 | << cpp_strerror(-r) << dendl; | |
416 | p = rbl.begin(); | |
417 | try { | |
418 | uint32_t num_acks; | |
419 | decode(num_acks, p); | |
420 | // Not only do we not care about the payload, but we don't | |
421 | // want to empty the container; we just want to augment it | |
422 | // with any new members. | |
423 | for (auto i = 0u; i < num_acks; ++i) { | |
424 | std::pair<uint64_t, uint64_t> id; | |
425 | decode(id, p); | |
426 | auto ir = acks.insert(id); | |
427 | if (ir.second) { | |
428 | ldout(cct, 20) << "robust_notify: acked by " << id << dendl; | |
429 | } | |
430 | uint32_t blen; | |
431 | decode(blen, p); | |
432 | p.advance(blen); | |
433 | } | |
434 | ||
435 | uint32_t num_timeouts; | |
436 | decode(num_timeouts, p); | |
437 | for (auto i = 0u; i < num_timeouts; ++i) { | |
438 | std::pair<uint64_t, uint64_t> id; | |
439 | decode(id, p); | |
440 | // Only track timeouts from hosts that haven't acked previously. | |
441 | if (acks.find(id) != acks.cend()) { | |
442 | ldout(cct, 20) << "robust_notify: " << id << " timed out." | |
443 | << dendl; | |
444 | timeouts.insert(id); | |
445 | } | |
446 | } | |
447 | } catch (const buffer::error& e) { | |
448 | ldout(cct, 0) << "robust_notify: notify response parse failed: " | |
449 | << e.what() << dendl; | |
450 | continue; | |
451 | } | |
452 | // If we got a good parse and timeouts is empty, that means | |
453 | // everyone who timed out in one call received the update in a | |
454 | // previous one. | |
455 | if (timeouts.empty()) { | |
456 | r = 0; | |
457 | } | |
458 | } | |
459 | } | |
460 | } | |
461 | return r; | |
462 | } | |
463 | ||
464 | void RGWSI_Notify::register_watch_cb(CB *_cb) | |
465 | { | |
466 | RWLock::WLocker l(watchers_lock); | |
467 | cb = _cb; | |
468 | _set_enabled(enabled); | |
469 | } | |
470 | ||
471 | void RGWSI_Notify::schedule_context(Context *c) | |
472 | { | |
473 | finisher_svc->schedule_context(c); | |
474 | } |